Question
How would you distinguish between $Zn ^{2+}$ and $Pb ^{2+}$ using ammonium hydroxide solution?
✓
Answer
Distinguish between zinc ion and lead ion.
$
ZnSO _4+2 NH _4 OH \longrightarrow Zn ( OH )_2 \downarrow+\left( NH _4\right)_2 SO _4
$
$Zn ( OH )_2$ forms white gelatinous precipitate. In the presence of excess of ammonium hydroxide these precipitates get dissolved.
$
Pb \left( NO _3\right)_2+2 NH _4 OH \longrightarrow Pb ( OH )_2 \downarrow+2 NH _4 NO _3
$
$Pb ( OH ) 2$ forms white precipitate. This precipitate is insoluble in the presence of excess of ammonium hydroxide.
$
ZnSO _4+2 NH _4 OH \longrightarrow Zn ( OH )_2 \downarrow+\left( NH _4\right)_2 SO _4
$
$Zn ( OH )_2$ forms white gelatinous precipitate. In the presence of excess of ammonium hydroxide these precipitates get dissolved.
$
Pb \left( NO _3\right)_2+2 NH _4 OH \longrightarrow Pb ( OH )_2 \downarrow+2 NH _4 NO _3
$
$Pb ( OH ) 2$ forms white precipitate. This precipitate is insoluble in the presence of excess of ammonium hydroxide.
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